Pipe-threading machine



1,527,185 L. s. HALL PIPRTHREADING MACHINE Filed Sept. 15. 1921 5 Sheets-Sheefc' 1 Feb. 24. l 925.

F b. 24,1925. 1,527,185 L. S. HALL PI PE THREADING MACHINE Filed Sept. 15, 1921 SSheets-Sheet 2 amto'c I L. S. HALL PIPE THREADING MACHINE Filed Sept. 15, 1921 3 Sheet-Sheet 5 mnumzmk Patented Feb. 24, 1925.

, UNITED STATES TE -Torsion.

LESLIE S. HALL, OF BRA NTFORD, ONTARIO, CANADA. ASSIGNOR TO WILLIAMS TOOL CORPORATION, OF ERIE, PENNSYLVANIA, A CORPORATION OF DELAWARE.

rrrn-rnnnamne MACHINE.

Application filed September 15, 1921. Serial No. 500,870.

To all whom it may concern: i

Be it known that ,I, LESLIE S.-HnLL, a subject of the King of Great Britain, residing at Brantford, in the Province of Ontario and Dominion of Canada, have invented certain new and useful Improvements in Pipe-Threading Machines, of which the following is a specification.

The present invention-relates to pipe -'threading machines, and particularly to the structure of the cutter head, objects of the invention being .to improve and simplify this structure to reduce the cost by using fewer and smaller dies or chasers,'and tomake these smaller size dies serve for cutting taper threads of any desired length.

\ Another object of the inventionis to provide the combination of a head and dies of such structure as to permit of the use of a single set'of dies over an unusuall Wide range within a head of the usual an prime tical size.

A further object is to provide dies or cutters which, while movable radially either during adjustment or in operation,

as r1g1dly secured by screws 24 to a carr er .are rigid in respect to the line of the thread beingfcut. f k

These and other objects are attained in the'embodiment of the invention illustrated in the accompanying drawings, wherein:

Figure his a broken part-sectional face view of the cutterhead;,

, ure 1.

V'Figure 2 is a side elevation of the same;

Figure 3 is a vertical sectional view on substantially the plane of line 3 -3 of Figurelgand Figure 4' is a broken sectional view on substantially the plane ,of line 4-4 of "Fig The base 5 of the cutter head is mounted to slide, in the usual way, upon a suitable bed 6 and carries the upright head piece 7 which forms a (rigid support for'the die mechanism.

The dies or chasers, 8 are carried by chaser blocks. 9', operating in substantially 1 "radial guide slots 10, in the annular su 'porting head 11, which is carried by t e rigid upright 7. Y

blocks. The blocks also are of sp'eciahconstruction, being each made up of toverlaid plates 14,- 14, secured together by screws 16, the outer plate (14) being shouldered at 17, to fit the corresponding overhang-of the guide slot-(Fig. 4e) and both being slotted at 18 to receive the chaser (Fig. 1), the slot in the outerplate 14 being deeper (Fig. 3) to provide a seat for the shank of the chaser and the inner plate forming an anchorage for the-chaser securing screw 13 and a supporting abutment engaging the shoulder at the back of the chaser.

The chaser blocks are adjusted radially by a rotatably adjustable member 19, hav- "readily removed.

The member 19 is a cam carrier show'n ring 25, surrounding the chaser and head construction and having an inwardly proecting flange 26 riding on the annular portion of the supporting head in back of the confining shoulder 27. This carrier ring forms a protective; cover pver the chaser blocks, but may have cut cuts 28, adjacent the outer ends of the chaser blocks to enable removal 0f the blocks.

For adjusting the member 19, I have "ehowna worm 29, dire'ctly engaging teeth 30, in its rim, saidworm being journaled in suitable brackets 31, carried by the stop ring 32 which is adjustably confinedLon the annular head between-the flange of the carrier and the face of the upright suppont After desired adjustments are ma e, the stop ring and cam carrier can be locked together by the handled clamp nut 33, at the back of the stop ring, engaged on I the screw stud 34 projectin'g'from the carrier rearwardly through a slot 35 in th ring. 4 I

The travel of the stop ring in one direction termine y an outstanding stop 37 on the v is limited, in the illustration, by an adjust ring, engaging the conipal face of a guide 38. This taper guide, as it is called, is preferably in the form of a sleeve adapted to be adjustably secured on a rigid supporting rod 39, by a clamp screw 40. A spring 41, engaged between the end of the taper guide and the rod-guiding bracket 420i the carriage, operates when the set screw 40 is loosened, to thrust over against an 'adjustable stop screw 43 on the carriage (Figz 2).

The construction disclosed enables a maximum adjustment of the chasers, giving the machine a: wide range of usefulness in' threading large and small size pipe. Also it pinion or other adjusting means. The chaser blocks 9 with the chasers 8 are then forced radially inward into cutting engagement with the end of the revolving pipe thror h the operation of the worm 29 with a resu t-' ing circumferential movement of the cam carrier ring 25 in a counter-clockwise direction as viewed in Figure 1 of the drawing. When the chasers have been thus brought into operative position a preliminary threading operation is proceeded with until the ta ered cutting surfaces of the chasers have a vanced along the pipe until a threaded section hasbeen formed having a width equal to the width or depth of the chasers.

measured axially of the work.

It will be clear that when the chasers have traversed the work for a distance equal to their own width, a gradual expandlng or radial outward movement thereof must be provided to continue the tapered thread sec-f tion thus begun.

During the preliminary part of the threading operation referred to the taper guide member 38 has been free to move to the left in Figure 2 with the moving cutter head, the clamping screw 40 being adjusted to permit the guide memberto slide along the fixed rod 39 for the purpose. In 'order to continue cutting a tapered section after the preliminary tapered section has. been formed, the clamping screw 40 is tightened to lock the guide member 38 to the fixed rod 39 so that continued movement of the cutter head causes the member 37 to move along the u 'per surface of the taper guide member 38. his movement of the stop member 37 along the inclined surface of the tapered guide permits a correspondingrotation of the stop ring 32 and .the cam ring 25 in a clockwise direction in Figure 1 to permit a gradual expansion or spreading of the chas ers 8 under the spreading pressure of the entering pipe to obtain the desired tapered thread section.

During the =movement of the cutterhead While the taper guide is held stationary, the stop 43 has/been withdrawn from the guide member and the spring 41 has been compressed by the movement of the bracket member 42.- Following the completion of .the threading operation the resetting of the parts preparatory to a new operation and the loosening of the screw 40 permits the spring 41 to move the tapered guide to its normal inoperative position in engagement with the stop 43. j

It will be seen that a tapered thread section indicated in dotted lines at 44 in Figure 3 of the drawings and having an angle or inclineequal to that of the tapered guide member. 38 will be thus produced. It will also be clear that tapered thread sections of various inclinations can be obtained by the.

use of guide embers having different angular tapered sections. The use of the simple form of tapered guide member shown produces uniform and accurate results in that the guiding conical members can be formed with a high degree of accuracy and the guiding surface is faithfully followed in operation through the direct pressure of the work itselfn I claim: I i r 1. In a pipe threading machine, a support, a shouldered annular head carried thereby and provided with substantially radial guides, chaser blocks operating in said guides and provided with projecting studs, a cam plate engaged over said blocks and having cam slots receiving said studs,

a carrier r said cam plate rotatably engaged on the annular head and having a flange engaged in back of the shoulderp thereon, a stop ring rotatably confined on the annular head between said flan e and thesu pport aforesaid, means for adjusting the cam carrier about the head and with respect to the stop ring, means for ldcking the cam carrier an stop ring in relatively adjusted relation and adjustable'stop means for the stop ring.

2. The structure of claim 1, in which said adjustable stop'means includes a tapered sleeve" with means for adjustably'supporting the same and an outstanding element on'the stop ring, adapted to ride over the taper of said sleeve.

3. In a machine of the character disclosed, a supporting head provided with substantially radial bly adjustable on said head and having cam connection with the blocks, means for aduides, chaser blocks operating 1n sa1d gui es, a member rotatajusting said member, a stop ring rotatably adjustable on the head, with'respect to the ing its travel in the opposite direction;

4. The structure of claim 3, in which the means for adjusting the cam member is in the form of a worm carried by the "stop ring.

5; The structure of claii 3 in which the conical guide means includes aconical sleeve adjustably engaged on a fixed sup-- porting member andengaged by'an out standing element on the stop ring.

6. The combination of claim in which the adjustable stop means includes'a stop on the stop ring, a support on which the conical guide is slidably held. andaclamp for securing, said guide in adjusted relation on its support.

7. The combination of claim 3 in which the adjustable stop means includes a stop on the stop ring, a support on which the conical guide is slidably held, a clamp for securing said guide in adjusted relation on its support, a stop for limiting free travel of the guide on its support, and a spring for holding said guide normally engaged with said stop.

S. In a machine of the character de scribed, a movable carriage, a supporting structure therefor, a cutter head on the carriage provided with chaser blocks and a cam for adjusting the same, a member adj ustably connected with said cam and provided with a stop, a tapered guide sleeve engaged by said stop, a rod carried by the supporting structure and on which said guide sleeve is adjustably engaged, an adj ustable stop for said guide sleeve mounted on the carriage, a spring for holding the sleeve normally engaged with said stop, and

, means for temporarily securing the sleeve in various relations on the supporting rod.

9. In a machine of the character described, a chaser block comprising plates secured in overlying relation and both slot- .ted at the .end,'one deeper than the other,

and a chaser having a red iced shank seated in the deeper slot and a wider head portion seated in the slots in both plates,

10. In a machine of the character described, a chaser block comprising plates secured in overlying relation and both slotted at the end. one deeper than the other, and a chaser having a reduced shank seated in the deeper slot and a wider head portion seated in the slots in both plates, and an actuating pin for the block having portions engaged in both plates and an anchorage flange engaged between the plates;

11. In a. pipe threading machine, a cutter head mounted for movement along the longitudinal axis of the pipe as the thread is cut, a plurality of chaser blocks and chasers carried by said head, a cam member carried' by said head for simultaneously operat ing said blocks and controlling the positions ofsaid chascrs, a stop operatively connected to said cam men'iber, a tapered guide with which said stop is in engagement, said stop moving down said tapered guide as the head advances to cause said-cam memher to rotate and spread said chasers gradually to form a tapered thread on the pipe. 12. In a pipe threading machine, a cut-' ter head mounted for movement along the longitudinal axis of the pipe as the thread is cut, a pluralityfoi chaser blocks andchascrs carried by said head, a cam member carried by said head for simultaneously operating said blocks and controlling the positionsol said chascrs, a stop ring carried by said head, means arried by said ring for adjusting the position of said cam member. means for locking said ring to said member. a stop carried by said ring, a tapered guide with which said stop is in engagement, said stop moving down said tapered guide as the head advances to cause said cam member to rotate and spread said chasers gradually to form a tapered thread on the pipe.

12). in a pipe threading machine, a cutter head mounted for movement along the longitudinal axis of the pipe as the thread is cut, a plurality of chaser blocks and chasers carried by said head, a cam member carried by said head for simultaneously operating said blocks and controlling the positions of said chasers, a stop ring carried by said head. means carried by said ring for adj.ust ing the position of said cam menrbcnmcans for locking said ring tosaid member, a stop carried by said ring, a tapered guide with which said stop is in engagement, said stop moving down said tapered guide as the head advances to cause said cam member to rotate and spread said chasers gradually to form a tapered thread on the pipe, and means for adjusting the position of said guide with respect to said stop. V

14. In a-pipe threading device, a thread cuttin member formed to cut a tapered threasection, means for moving the thread cutting member longitudinally of the work to form a tapered thread section equal in Width to the width of the thread cutting member, a tapered guide member mounted to move longitudinally of the work with the thread cutting member while saidtapered thread section is being formed, means for locking said tapered guide member against movement when said threaded section has been formed, and means whereby the movement of the thread cuttingmember is controlled by the tapered guide to continue the formation of the tapered thread section.

I ter head, slidable chasers carried by said head, controlling mechanism for automat-. ically regulating the movement of said chasers including a rod mounted in fixed relation to said .head, and a conicalsleeve adjustably mounted on said rod.

16. In a pipe threading machine, a head carrying slidable chasers and chaser blocks,- a cam ring rotatable on said head for moving said chasers, a conical guide for determining the degree of movement ofsaid cam ring, and operative connections I between said cam ring and said guide including a second ring adjustably mounted on said head and adapted to be locked with said cam ring. 17. 111 a pipe threading machine, a head carrying slidable chasers and chaser blocks, a cam ring rotatable on sa id'head for moving said chasers, a conical guide for determining the degree. of movement of said cam ring, operative connections between said cam ring and said guide including a second ring-ad justably mounted on said head and adapted to'be locked with said cam ring, and a lug on said second named-ring for engagement with said conical guide.

18. In combination with a pipe threading machine, a support, a shouldered head carried thereby. chasers and chaser blocks slidable on said head, a flanged ring mounted over the face of said head and cooperating with said shoulder for rotarymovemcnt, connections betweensaid ring. and said chaser blocks, and controlling means for said ring including a second ring on said head held between said support'and said flange.

19. Incombination with a pipe threading machine, a support, a shouldered head carried thereby, chasers and chaser blocks'slidable on said head, a flanged cam ring mounted over the face of said head and cooperating with said shoulder for rotary movement, connections between said ring and said chaser. blocks, and controlling means for sa d ring includlng a second ring on said v head held, between said support and 581d flange, and means to lock said rings together.

20. In combination with a pi e thread- 'mg machine, asupport, a shoul ered head carried thereby; chasers and chaser blocks shdahle on said head, a flanged cam ring v mounted over theface of said head and co- 4 operating with said shoulder for rotary movement, connections between said ring and said chaser blocks, controlling means for said ring including a second ring on said head held between said support and said flange, means to lock said rings together,

and means to adjust said cam ring independently of said second ring.

21. In combination with apipe threading machine, a support, a shoulder head carried thereby, chasers and chaser blocks slidable eu'said head, a flanged cazn ring mounted over the face of said head and cooperating with said shoulder for rotary movement, connections between said cam ring and said chaser blocks, controlling .means' for said ring'including a second ring' on said head held between said support and said flange;

. LESLIE s. HALL. 

